During a diffraction grating and Emission spectrum lab: 1. What is the purpose o

Question

During a diffraction grating and Emission spectrum lab:

1. What is the purpose of the collimator in the spectrometer? Can this experiment be done without it? Why? If yes, then under what conditions?

2 Why was it vital to place the diffraction grating upright and with the surface facing the telescope?

3. Why was it important to align the crosshair with the left side of each spectral line? Can you still take accurate readings if the alignment was done on the right side? Explain why and/or under what conditions?

Explanation / Answer

A collimator is a device that produces the parallel beam of particles or waves. In optics language, we can say that the collimator produces the parallel rays of light.

In general in consists of a convex lens and an aperture with separation less than the focal length. This leaves the light coming from the aperture as collimated.

It helps in spectroscopy, it will be used to collimate the different diffracted orders coming from the grating. Although they are collimated in nature but they all are overlapped with propagation. To avoid this we will use the collimator.

This helps to increase the resolution in sp[ectroscopy.

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